The web has democratized a lot of things since its birth, including the learning previously available only with a hefty tuition check. College site Education Portal has a handy list of the colleges that offer the most comprehensive course material online, including open-course trailblazers like the Massachusetts Institute of Technology and Tufts University, and programs like Stanford’s lecture podcasts on iTunes U. You can’t get a sheepskin for free, but you can further your knowledge and training for less than even the cost of a book. For way more college-based free learning, check out Wendy’s comprehensive guide to the .edu underground.